php:code-beautifier-and-fixer:install:dev

The "composer require" command is used in PHP to manage dependencies in a project. It allows you to install and manage packages or libraries required by your application.

In this specific case, the command "composer require --dev squizlabs/php_codesniffer" is used to install the PHP_CodeSniffer package by squizlabs.

Here's a breakdown of the command and its options:

• "composer": This is the command line tool for managing the dependencies of a PHP project.
• "require": This option tells Composer to add a new package to the project's dependencies.
• "--dev": This option specifies that the package being installed is only required for development purposes, such as for testing or code quality analysis.
• "squizlabs/php_codesniffer": This is the package name and vendor name. It points to the specific version or range of versions of PHP_CodeSniffer provided by squizlabs.

By running the command, Composer will access the PHP Package Index (Packagist) and fetch the specified package. It will then analyze the project's composer.json file, determine the correct version of the package to install, and download it along with its dependencies.